Cheers,

specs as below. Also thinking of adding another sata harddrive.

CPU:Intel Core 2 Duo Conroe E6300
Motherboard:Intel P965LTCK
Graphics Card
: Gigabyte 7600GT Silent Pipe II
RAM: 2 x 1GB Corsair pc5300
Case: Antec Sonata II
PSU: Antec Smartpower 450Watt
HDD: Western Digital Caviar 250GB Sata
Dvd Burner: LG 16x Super Multi
Dvd reader/cd writer: Lg CD/DVD Rom Drive
Floppy: Panasonic Floppy Drive
Operating System: Windows XP Professional 32Bit
Monitor: 2 x Samsung Syncmaster 940N
Keyboard/mouse: Standard Microsoft Keyboard and Mouse

Well then I think the Corsair 450 VX should do great.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139003

Thanks for your help

Ended up getting the HX520W with triple 12v rails and its working perfect

Never thought a PSU could cause such a range of issues.... Thanks again.

Korrupt